Journal
FEBS LETTERS
Volume 585, Issue 12, Pages 1717-1721Publisher
WILEY
DOI: 10.1016/j.febslet.2011.04.076
Keywords
Photosynthesis; State transition; Light harvesting complex II; LHC II kinase; Redox sensing; Plastoquinone; Thioredoxin
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State transitions are acclimatory responses to changes in light quality in photosynthesis. They involve the redistribution of absorbed excitation energy between photosystems I and II. In plants and green algae, this redistribution is produced by reversible phosphorylation of the chloroplast light harvesting complex II (LHC II). The LHC II kinase is activated by reduced plastoquinone (PQ) in photosystem II-specific low light. In high light, when PQ is also reduced, LHC II kinase becomes inactivated by thioredoxin. Based on newly identified amino acid sequence features of LHC II kinase and other considerations, a mechanism is suggested for its redox regulation. (C) 2011 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.
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